/Engine/Source/Runtime/Engine/Public/Animation/AnimTypes.h
Raw keyframe data for one track.Each array will contain either NumFrames elements or 1 element. One element is used as a simple compression scheme where if all keys are the same, they'll be reduced to 1 key that is constant over the entire sequence.
struct FRawAnimSequenceTrack
TArray< FVector...
PosKeys
Position keys.
TArray< FQuat4f...
RotKeys
Rotation keys.
TArray< FVector...
ScaleKeys
Scale keys.